Malicious PDF — malware analysis report

Static analysis result for SHA-256 073df6a89a932ee9…

MALICIOUS

PDF

91.0 KB Created: 2021-09-17 21:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7dc1a064fcd01dddf049f9b2e95c1e7b SHA-1: 4e4e0b989dd2ff2206059ac81cecc5a7bda60391 SHA-256: 073df6a89a932ee990c205126a31c00e1c10d71188b02a6e2b5a4b503c7e09b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple URLs pointing to compromised or disposable hosting, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially exploiting vulnerabilities or presenting deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://urologasdainys.lt/userfiles/file/likobo.pdf In PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/lukavuseniv.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/miraxekal.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4f0f328e8---gulakimuwebebimi.pdfIn PDF document text
    • http://mc-opony.pl/files/file/17298340288.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/99866867845.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/sowul.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/mujusodewazozepuwutu.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/61183976961.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/luvijikuk.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/vamenodajalizinejikuza.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/rarenibitevusuga.pdfIn PDF document text
    • https://cubic.is/userfiles/file/kiralabizonijovibezerevi.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/xufegoxipunaf.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///75663637555.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/13748029246.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/42856680026.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/vilijapalaxomub.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/30429761260.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/laxerep.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/kefemed.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdff6baa9c---guzadezorifilajekowaruza.pdfIn PDF document text
    • https://kiptep.ru/file/47051486294.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9c5beac3f---xawavufe.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/45741004061.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/30914823376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=regarder+after+we+collidedPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB02 10508 bytes
SHA-256: 450de82802b8dfd2a9a6d70d3ee6077ccef5a018b512cd1cc6f5294d749b5fb8
font_01_sfnt_off000112e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF3 19624 bytes
SHA-256: 0935bdb628605a47f959ee782f478adf3dd3c4f7bb237dfbb835fe48873bb5e8